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virglrenderer crashes on a call to virgl_renderer_get_fd_for_texture()

A gdb output snippet:

(gdb)
#0  virgl_egl_get_fd_for_texture (ve=0x0, tex_id=205, fd=0xffff60e6586c)

This is caused by the fact that egl_info is initialized only when the VIRGL_RENDERER_USE_EGL flag is passed. But the flag and the value of egl_info are not checked in virgl_renderer_get_fd_for_texture() and virgl_renderer_get_fd_for_texture2().

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